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Norwegian researchers found a threefold increased likelihood that the daughters of women who suffered from a severe form of morning sickness called hyperemesis gravidarum will develop the condition as well. The finding indicates that genetics might have a "strong influence" on the development of the condition, although there may be other contributing factors, the lead researcher said.

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Public school children in Pennsylvania are required to be vaccinated against conditions such as measles, polio, chickenpox and tetanus, but exemptions are allowed for families with a "strong moral or ethical conviction similar to a religious belief." The state currently is offering free measles vaccines.

Full-term babies born small for gestational age to mothers with preeclampsia had a threefold higher risk of developing cerebral palsy than those born to women without the condition, a Norwegian study showed. However, very preterm babies who were not small for their gestational age born to mothers with preeclampsia were half as likely to have cerebral palsy compared with peers born to women without the complication, researchers said. The findings were published in journal BMJ.

In a study of 254 women suffering from hyperemesis gravidarum, adverse pregnancy outcomes including premature births and low birth weight babies were associated with antihistamine use, according to a six-year study in the European Journal of Obstetrics & Gynecology and Reproductive Biology. Researchers noted that such medications were effective in less than 20% of the users.

Pregnant women who were admitted for severe morning sickness during the second trimester had a twofold increased risk of developing preeclampsia and were 1.4 times as likely to deliver a baby that was small for gestational age compared with those who did not suffer from the condition, a Swedish study found. The results appear in the journal BJOG: An International Journal of Obstetrics and Gynaecology.

More people were vaccinated against the seasonal flu and the H1N1 flu this season than in any other season, according to a CDC report. The agency, however, continues to urge people to get the vaccines every year and is aiming for 60% coverage for adults and 90% coverage for people over age 65.